What is the joint probability of being between the ages of 18 and 40 and most commonly using a smartphone? The table shows data about what type of phones that adults use. The respondents adults were...

Extracted text: What is the joint probability of being between the ages of 18 and 40 and most commonly using a smartphone? The table shows data about what type of phones that adults use. The respondents adults were divided into three groups depending on their age: 66 years and older, 41-65 years, and 18 - 40 years of old. Smartphone Other Mobile Phone Landline Age 18-40 Age 41-65 Age 65 or older 60 30 10 40 40 20 20 30 50